Only on certain rare occasions, when a daimio wished to increase the number of his men-at-arms, and recruited some of his _samourai_ from the _heimin_, or, again, when a _ronin_, tired of vagabondage, embraced some trade or other and contrived to lose himself among the people, were the barriers between class and class ever broken down, and thus society in Japan remained strictly confined within its narrow boundaries for over two centuries. Notwithstanding these restrictions, the country enjoyed during this period a profound peace and great prosperity. Both Ieyas and Iemitsu understood to perfection how to apply the maxim, ‘Divide in order to reign,’ whereby they broke up the influence of the daimios, which, when united, might have proved formidable. This they contrived to do by isolating them from the Imperial Court, and creating between them divergences of interest, and by fermenting among them a spirit of hatred and jealousy. Ieyas had not dared dispossess all his adversaries after his victory, but he confiscated a part at least of their domains, out of which he created a number of fiefs, which he distributed among his allies and soldiers. The descendants of these, the _kammong_ and _foudai_ princes, being ever at war with the _kokushu_ and the _tozamma_, obtained protection from the Shoguns by establishing a common bond of interest, being fully aware that the downfall of the Tokugawas would be sure to involve their own. A danger undoubtedly presented itself to the south-east of the Empire, for here the domains of the _kokushu_ princes of Choshiu, Satsuma and Hizen and others nearly as powerful formed a continuous line of territory, and consequently a storm rising in that quarter might have been fatal to the Shogunate; but so long as these great vassals received no support from a foreign power, the military preponderance of the Shogun was safe. This state of affairs eventually gave rise to a rigorous exclusion of foreigners. Divided among themselves, isolated from all external influences, deprived of all communication with the Court, the daimios in due time lost a great deal of influence in their own principalities. By virtue of the Sankin law, promulgated in 1635 by Iemitsu, and solemnly ratified by the Mikado, they were compelled to sojourn at least one year out of two at Yedo, and to leave their women and children during the following year in that capital as hostages. In this manner their initiative was enfeebled, and as they were obliged in great part to leave the administration of their own affairs in the hands of subordinates, they soon became mere idlers, under the constant supervision of a swarm of spies, who reported to the Shogun any attempt on their part to resist his authority, or to conspire against him. Notwithstanding its many drawbacks, this administrative system, although it unquestionably weakened the political character of the Japanese, was in the long-run, by securing a prolonged peace, exceedingly beneficial